And on a side note for those concerned with your electric bill, 3 400w mh @458w's per light is 1,374 watts that's 1.3 kilowatts. If you average 10 hours a day with lights on that's 2,500 hours a year per light. So 1.37Kw × 7,500hours is 10,305kw per year so if your being charged 1 cent for every kW used, some pay much more, that's 1,030$ a year! That's almost 3$ a day....no thanks that's why most indoor horticulturist are moving away from hid lamps and moving to led as more powerful lights become available technology just isn't quite there yet